CN1322780C - Method for selecting community by multi-mode mobile terminal - Google Patents

Abstract

The present invention discloses a multimode mobile terminal small area selection method. A multimode mobile terminal preferentially stays in a small area with a preferential mode in the processes of the selection and the repeated selection of a small area. As long as the signal quality of the small area satisfies communication requirements under the current selection mode, signal transceivers of other modes in the current multimode mobile terminal are closed, and signals of small areas under the other modes are not monitored. The repeated selection is only carried out between different small area under the current selected mode. The signal transceivers of the other modes are opened according to a priority order which is preferentially set only under the condition that the signal quality of the small area under the current selected mode can not satisfy the communication requirements, and the repeated selection between the small areas under different modes is carried out. The method not only furthest lowers power consumption of the multimode mobile terminal for selecting the small areas and reduces the waste of network resources, but also fully exerts respective advantages of a 2G network and a 3G network when the 2G network and the 3G network are combined.

Description

Method for cell selection by multi-mode mobile terminal

technical field

The invention relates to cell selection technology in wireless communication, in particular to a method for cell selection and reselection by a multi-mode mobile terminal.

Background technique

With the rapid development of mobile communication and the continuous improvement of users' demand for services, the existing second-generation digital mobile communication system (2G) is difficult to meet the needs of high-speed data services, such as: the existing Global System for Mobile Communications (GSM) Or a narrowband code division multiple access (CDMA) communication system can only provide basic voice services and some simple message services; for dynamic and real-time data services, its data bandwidth cannot meet the requirements of service quality. Although the 2.5th generation mobile communication system such as General Packet Radio Service (GPRS) has appeared, its data bandwidth capability has not been substantially improved. Moreover, for video services such as video telephony, the quality of service cannot be guaranteed on 2G or 2.5G. Therefore, the third generation mobile communication system (3G) satisfies the quality of service requirements of a large number of data services due to its characteristics of wide data bandwidth and strong data service processing capability, and thus has been widely developed. For a long period of time in the future, the second-generation mobile communication system will coexist with the third-generation mobile communication system, so there will be many overlapping coverage areas of the two communication systems.

In order to adapt to the development of mobile communication systems, mobile terminals have also developed from traditional analog terminals to digital terminals, but the current digital terminal mobile phones such as GSM mobile phones are all single-mode mobile phones, which only support communication with one mobile communication system; while 3G The emergence of 3G networks and the coexistence of 2G networks have led to the development of multi-mode mobile phones. The so-called multi-mode mobile phone is a terminal mobile phone that supports two mobile communication system modes at the same time. The existing multi-mode mobile phone generally includes the following parts: at the same time, it has the transceiver processing unit of the 2G terminal and the transceiver processing unit of the 3G terminal, the terminal casing, and the terminal keyboard. , terminal display, receiver and transmitter, battery. Wherein, the transceiver processing unit is the transceiver of the mobile terminal.

Traditional digital mobile terminals that support 2G communication, such as GSM mobile phones, because the GSM processing protocol is simple and GSM adopts time-division communication, the power consumption of GSM mobile phones is relatively low during communication; and in 3G, due to the use of CDMA communication technology, the frequency bandwidth , the power efficiency of the general radio frequency is low, and the entire communication protocol of 3G is complicated, which makes the power consumption of the 3G mobile phone relatively large. Under the same battery capacity, the talk time and standby time of 2G mobile phones are longer than those of 3G mobile phones. According to manufacturer data, in the case of the same battery capacity, the voice communication time based on the GSM system is 17 hours, while the voice communication time based on the WCDMA system is 17 hours. The communication is 2.5 hours, the difference is very large. In addition, the emergence of 3G networks is mainly due to the fact that the communication bandwidth of 2G networks cannot meet the needs of data services, so the main characteristics of 3G networks are reflected in the processing capabilities of data services; while 2G networks are mainly positioned in voice and simple message services. Look, the 2G network is very mature for voice services and its capacity can meet the needs. The voice quality is basically comparable to that of fixed voice. Therefore, if 2G and 3G are organically combined, they will achieve complementary advantages and ensure business service quality. As well as improving the overall capacity of the network to achieve significant results.

As shown in Figure 1, usually after the power-on self-check, the mobile terminal first needs to select a network for registration. Report the registration failure to the mobile terminal; if the registration is successful, the mobile terminal chooses the most suitable cell to reside in and enter the idle state, waiting for the initiation of the service. When the mobile terminal enters the idle state, according to the provisions of the 3GPP 25.304 standard protocol, the mobile terminal monitors all the surrounding cells that may be monitored according to the measurement control message in the network system message, so as to find a better cell in time for camping . The better cell may be a cell of the communication system to which the network belongs at the time of registration, or may be a cell of another communication system of the same operator. If a better cell is detected, the mobile terminal will activate the cell reselection mechanism and reselect a more suitable cell to camp on.

The 3GPP 25.304 standard protocol specifies a cell reselection mechanism. This mechanism is mainly based on measuring all the surrounding cells that may be monitored, after obtaining the signal strength of all the surrounding cells that may be monitored, and then according to a certain threshold criterion Screen the signal quality of each cell, and determine the most suitable cell as the residential cell after cell selection and reselection. The above process is applicable to both single-mode mobile terminals and multi-mode mobile terminals. However, for multi-mode mobile terminals, it is necessary to simultaneously monitor the signals of all possible cells under the 2G network and 3G network to which it belongs. Therefore, the existing selection cell The method for the multimode mobile terminal has the following defects:

1) The multi-mode mobile terminal in the prior art needs to perform signal measurement on all surrounding cells that can be monitored in the idle state. Then, where the 2G network and the 3G network are covered at the same time, it is necessary to measure the signals in the two communication modes. Measurements are performed on several cells of the multi-mode mobile terminal, so that both the 2G receiver and the 3G receiver of the multi-mode mobile terminal are in working condition. Even if the energy-saving sleep mode is adopted, the multimode mobile terminal will be in the working state periodically; and the 2G receiver and the 3G receiver in the multimode mobile terminal cannot be completely turned off under the sleep mode, so that the multimode The power consumption of the mobile terminal in an idle state increases.

2) In the area where the 2G network and the 3G network overlap and cover, since the multi-mode mobile terminal will select the optimal cell as the residence cell among all the cells that can be monitored in the 2G and 3G networks, this makes the multi-mode mobile terminal The possibility and times of cell reselection in this state increase. Especially when the 2G cell and the 3G cell do not overlap to the greatest extent, due to the fluctuation of the wireless signal and the possible movement of the user, the multi-mode mobile terminal may frequently reselect and reside between the 2G cell and the 3G cell, resulting in multi-mode mobility. The wireless link of the terminal is unstable, and many unnecessary network interactions will occur at the same time, wasting network resources.

3) The existing standard protocol does not fully consider the characteristics of 2G and 3G networks, so according to the specific conditions of the multi-mode mobile terminal, it may preferentially reside in a 2G cell or a 3G cell, and only through the multi-mode mobile terminal itself control to achieve the optimal combination of network service offerings.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for a multi-mode mobile terminal to select a cell, which not only minimizes the power consumption used by the multi-mode mobile terminal to select a cell, reduces the waste of network resources, but also fully utilizes the 2G network. Their respective advantages when combined with 3G networks.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for selecting a cell by a multi-mode mobile terminal, which supports at least two types of mobile communication system modes for the multi-mode mobile terminal, after the power-on registration is successful, the method for the multi-mode mobile terminal to select a cell to reside in includes the following steps:

a. Judging whether the currently resident cell is a cell in the preferred mode, if yes, proceed to step d, otherwise, proceed to step b;

b. The current multi-mode mobile terminal measures the signal quality of all the cells in the preferred mode that can be monitored, and judges whether it can reselect the cell in the preferred mode according to the measurement results. Cell reselection in the cell mode, then enter step c, otherwise, perform reselection between cells in the mobile communication system mode to which the cell currently resides, and then return to step b;

c. Judging whether the cell reselection is successful, if successful, the current multimode mobile terminal resides in the cell under the currently selected preferred mode, and enters step d, otherwise, the cell under the mobile communication system mode to which the cell currently resides Perform reselection between cells, and then return to step b;

d. The current multi-mode mobile terminal turns off the transceivers of all mobile communication system modes except the preferred mode in itself, and measures the signal quality of all cells in the preferred mode that can be monitored, and then judges whether it is necessary to perform different operations according to the measurement results For cell reselection between cells in different modes, if necessary, turn on the transceiver of another mobile communication system mode in the current multi-mode mobile terminal, and determine the target residence according to the signal quality of the cell in another mobile communication system mode that can be monitored cell, and complete the reselection from the current cell to the target cell; otherwise, return to step d.

Wherein, the judging whether the cell in the preferred mode can be reselected in step b is: the current multi-mode mobile terminal evaluates the signal quality of all monitored cells in the preferred mode, and judges whether there is at least one cell in the preferred mode. If the signal quality meets the resident standard, it is determined that the current multi-mode mobile terminal can reselect to the cell in the preferred mode; otherwise, it is determined that the current multi-mode mobile terminal cannot reselect to the cell in the preferred mode.

Then, when there is more than one cell in the preferred mode that satisfies the camping standard, step b further includes: determining the target cell to camp on in the preferred mode according to the evaluation criteria for the most suitable camping cell stipulated in the 3GPP protocol or the 3GPP-2 protocol.

The reselection between cells in the mode of the cell where the cell currently camps on as described in step b further includes: the current multi-mode mobile terminal measures the signal quality of all cells in the mode of the cell where the cell currently camps on that can be monitored, and according to the measured As a result, according to the evaluation standard of the most suitable resident cell, determine a target resident cell, and judge whether the determined target resident cell is the current resident cell; if yes, the current multi-mode mobile terminal continues to reside in the current resident cell ; Otherwise, execute the cell reselection process between the current camping cell and the target camping cell.

The above solution, before step a, further includes: setting the highest threshold value and the lowest threshold value of the cell signal quality in the preferred mode. Then the judgment in the step d whether needs to carry out the cell reselection between cells of different modes is:

d1. Judging whether the cell signal quality of all currently monitored cells in the preferred mode is less than the preset highest signal quality threshold value, if yes, then start the transmission and reception of another mobile communication system mode in the current multi-mode mobile terminal The signal machine monitors the cell signal in another mobile communication system mode, and then executes step d2, otherwise, determines the cell reselection in the preferred mode according to the current signal measurement result, and returns to step d1;

d2. Judging whether the cell signal quality of all currently monitored cells in the preferred mode is less than the preset signal quality minimum threshold value, if yes, then determine the target resident cell under another mobile communication system mode, and Execute the reselection from the current cell to the target cell; otherwise, measure all the cell signals that can be monitored in the preferred mode and another mobile communication system mode at the same time, and determine the preferred cell signal according to the measurement results of the cell signal in the preferred mode. cell reselection in mode, return to step d1.

After the described step d1 opens the transceiver of another mobile communication system mode in the current multimode mobile terminal, it further includes: setting and starting a timer, after the timer expires, judging whether there is a cell with high signal quality under the preferred mode Based on the highest threshold value of signal quality, if there is, then close the transceiver of another mobile communication system mode in the current multimode mobile terminal; otherwise, continue to maintain the transceiver of another mobile communication system mode in the current multimode mobile terminal is on.

When the judging result in step b is that the cell under the preferred mode cannot be reselected, the method further includes: the multi-mode mobile terminal judges whether it is in a cell with the highest priority other than the preferred mode, and if so, then stays in the current cell Perform reselection between the cells in the mobile communication system mode to which it belongs; otherwise, monitor all cell signals in the highest priority mode other than the preferred mode, and judge whether it can be reselected to the cell in the highest priority mode other than the monitored preferred mode, if If it is possible, then complete the reselection from the currently camped cell to the cell with the highest priority mode other than the preferred mode; if not, perform reselection between the cells in the mobile communication system mode to which the current camped cell belongs.

When the judging result in step c is that the cell reselection fails, the method further includes: the multi-mode mobile terminal judges whether it is in the cell with the highest priority other than the preferred mode, and if so, the mobile communication system mode of the cell where the current camping cell belongs to Otherwise, monitor all cell signals in the mode with the highest priority other than the preferred mode, and judge whether it can be reselected to the cell with the highest priority mode other than the preferred mode monitored, and if so, complete the current Reselection from the camped cell to a cell with the highest priority mode other than the preferred mode; if not possible, reselection between cells in the mobile communication system mode to which the currently camped cell belongs.

The method further includes: setting a priority order for all mobile communication system modes supported by the current multi-mode mobile terminal, and then opening the transceiver of another mobile communication system mode in step d is: opening according to a preset priority order The transceiver of the mobile communication system mode with the highest priority other than the preferred mode in the current multi-mode mobile terminal.

In step d, according to the signal quality of the cell in another mobile communication system mode that can be monitored, determining the target cell to reside on, and completing the reselection from the current cell to the target cell to reside on includes:

d': Determine whether the cell signal in the mobile communication system mode with the latest transceiver enabled can meet the resident standard, and if so, determine the target based on the monitored cell signal quality in the currently selected mobile communication system mode Residential cell, and complete the reselection from the current residential cell to the target residential cell; otherwise, start the next mobile communication system mode according to the order of priority and continue to execute step d'; if there is no next mobile communication system mode then End step d'.

In the solution above, the multi-mode mobile terminal is a dual-mode mobile terminal. Then the preferred mode is the Global System for Mobile Communications GSM mode in the second generation mobile communication network. The other mobile communication system mode is the wideband code division multiple access system WCDMA mode in the third generation mobile communication network.

It can be seen from the above scheme that the key of the present invention is: after the multi-mode mobile terminal is turned on and registered successfully, the cell under the preferred mode is preferentially selected, and after the residential cell is selected, the current multi-mode mobile terminal is turned off. Transceiver, until the signal quality of all available cells in the currently selected mode becomes poor, then turn on the transceivers in other modes according to the preset priority order, and reselect the appropriate resident cell.

Therefore, the method for cell selection by a multimode mobile terminal provided by the present invention has the following advantages and characteristics:

1) By controlling the opening and closing of the two modes of transceivers in the multi-mode mobile terminal, the idle state is realized, so that the multi-mode mobile terminal preferentially resides in the cell under the preferred mode during the cell selection and reselection process, such as GSM cell, in this way, can make full use of the 2G mode in the multi-mode mobile terminal, such as the advantages of low power consumption in GSM mode, which can significantly reduce the power consumption of the multi-mode mobile terminal in the idle and talking state, and improve the multi-mode mobility in the idle state. The standby time of the terminal and the talking time of the voice service.

2) Since the present invention selects a residential cell for a multi-mode mobile terminal, and at least one cell signal quality in the current monitoring mode meets the requirements, that is, when the signal quality of at least one cell is greater than the highest signal quality threshold, The transceiver of another mode in the multi-mode mobile terminal is in the closed state, so the present invention can greatly reduce the frequent selection and switching of the terminal between the 2G cell and the 3G cell, reduce unnecessary network interaction, and avoid network resources. waste.

3) Adopt the present invention, do not need to make any changes to existing network, only need increase the control to cell selection on the multi-mode mobile terminal, just can realize voice service to 2G network such as GSM shunt, and data service to 3G network Such as the purpose of WCDMA system shunting, so as to give full play to the advantages of the respective networks when the 2G network and the 3G network are combined. For example: when the GSM network is combined with the WCDMA network, GSM is very mature in the voice service and the voice quality is very good, while WCDMA has stronger and more complete functions in the data service processing capability, and the advantages of the two networks complement each other, thereby improving the overall The overall business service quality and capacity of the mobile communication network.

Description of drawings

FIG. 1 is a schematic flow diagram of a mobile terminal accessing a network;

Fig. 2 is a schematic flow chart of the realization of the method of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The core idea of the present invention is: in the process of cell selection and reselection, mobile terminals supporting multiple modes preferentially camp in a cell of a preferred mode, such as a GSM cell, and as long as the signal quality of the cell in the currently selected mode meets the requirements of communication requirements, it does not consider monitoring the signals of cells in other modes. The specific implementation method is: adopting the method of controlling the shutdown and start-up of multiple mode transceivers in the multimode mobile terminal, replacing the existing method of monitoring all possible cells under different modes. That is to say, as long as the cell signal in the currently selected mode meets the communication requirements, all the transceivers of other modes in the current multimode mobile terminal are turned off, and reselection is only performed between different cells in the currently selected mode; When the signal quality of the cell in the currently selected mode cannot meet the requirements, the transceivers of different modes are turned on one by one according to the preset priority order, and the cell reselection in different modes is performed. Wherein, whether the signal quality meets the communication requirement is obtained by comparing the monitored signal quality with a preset signal quality threshold value. The priority order of different modes can be determined according to user needs, or according to the quality of the network signal.

For example, for a dual-mode mobile terminal supporting GSM mode and WCDMA mode, by controlling the closing and opening of the GSM mode transceiver and the WCDMA mode transceiver in the dual-mode mobile terminal, it replaces all functions in the prior art. Evaluation of the measured signal quality of GSM cells and WCDMA cells. At the same time, if you want to stay in a GSM cell first, you can increase the possibility of camping in a GSM cell by setting different signal quality thresholds. In other words, when evaluating the signal quality of a WCDMA cell, improve the In the process of cell selection and reselection, it can become the signal quality threshold value of the cell to camp on, so that the purpose of allowing the dual-mode mobile terminal to preferentially camp on the GSM cell can be achieved.

The present invention is mainly proposed for the coexistence of 3G network and 2G network coverage area. The following takes the coexistence of the GSM system in the 2G network and the WCDMA system in the 3G network as an example to specifically illustrate the implementation of cell selection and reselection by the dual-mode mobile terminal. plan. In this embodiment, since the GSM system has strong voice processing capability and low power consumption, the GSM system is selected as the preferred camping mode of the dual-mode mobile terminal.

As shown in Figure 1, after the dual-mode mobile terminal is turned on, it will complete power-on self-check, network selection and network registration in sequence. Enter the idle state and wait for a call to come in. Then, when the dual-mode mobile terminal successfully registers and selects a cell, there are two options without using priority control: a) select a WCDMA cell as the cell to reside on; b) select a GSM cell as the cell to reside on .

As shown in Figure 2, the process of cell selection and reselection performed by the dual-mode mobile terminal in this embodiment includes the following steps:

Steps 201-202: After the registration of the dual-mode mobile terminal is completed and a certain cell is selected to reside in, it is first necessary to determine whether the dual-mode mobile terminal currently selects a GSM cell or a WCDMA cell, because the initial cell selection is arbitrary. If the dual-mode mobile terminal selects a GSM cell as the cell to reside on, then perform step 209; if the dual-mode mobile terminal selects a WCDMA cell as the cell to reside on, then perform step 203.

Step 203: the dual-mode mobile terminal resides in the currently selected WCDMA cell, and at the same time, the dual-mode mobile terminal performs signal measurement on all surrounding GSM cells that can monitor the signal by starting its own GSM transceiver; and, in After obtaining the signals of all monitored GSM cells, evaluate the signal quality of these cells. Wherein, the evaluation criteria of the signal quality may be in accordance with the signal evaluation criteria in the commercially available GSM system.

Step 204: According to the signal quality evaluation result in step 203, judge whether the signal quality of any GSM cell satisfies the camping standard, if so, go to step 207; otherwise, go to step 205. Wherein, the residency standard is the most suitable cell evaluation standard stipulated in the protocol.

Steps 205-206: continue to measure the signal quality of all the monitored WCDMA cells, and then, according to the measurement results of the signal quality of all the monitored WCDMA cells, determine a The WCDMA cell is used as the target resident cell. After that, you can further judge whether the determined target resident cell is the current resident WCDMA cell. If yes, it means that the current resident WCDMA cell Otherwise, perform a handover from the currently resident WCDMA cell to the target resident WCDMA cell, that is, execute the WCDMA cell reselection process, which is carried out completely according to the current 3GPP defined standard process, and then returns to step 203.

Step 207: Carry out the reselection from WCDMA sub-district to GSM sub-district. The specific method is: judge whether the signal quality of more than one GSM sub-district satisfies the cell residence standard, and if so, select a most suitable one in all available GSM sub-districts. The GSM cell is used as the target resident cell. The standard for selecting a suitable cell here is based on the evaluation criteria in the commercially available GSM system; if there is only one GSM cell whose signal quality meets the cell resident standard, then directly select the GSM cell as the target resident cell. Stay in the neighborhood. After determining the target cell to reside in, execute the cell reselection process from the WCDMA cell to the GSM cell, that is, switch from the currently resident WCDMA cell to the determined target GSM cell. The cell reselection process is completely in accordance with the current definition in 3GPP standard process.

Step 208: Judging whether the cell reselection is successful, if the cell reselection of the dual-mode mobile terminal is successful, execute step 209; otherwise, execute step 205.

Steps 209 to 210: The dual-mode mobile terminal resides in the currently selected GSM cell, and then the dual-mode mobile terminal turns off its own WCDMA transceiver, and performs a check on the surrounding GSM cells according to the working mode of the GSM mobile terminal. monitor.

Steps 211-212: Determine whether the cell signal quality of all currently monitored GSM cells is lower than the preset maximum signal quality threshold Up_Sir, where all the monitorable GSM cells include the currently resident GSM cell and the surrounding GSM cells that can be monitored All the GSM cells of the GSM cell, if yes, then perform step 213; otherwise, if the signal quality of one or more than one GSM cell exceeds the preset signal quality maximum threshold Up_Sir, then continue to maintain the WCDMA transceiver in the current dual-mode mobile terminal At the same time, according to the current signal measurement results, it is determined whether cell reselection is required. If necessary, the target GSM cell is determined. The standard for selecting a suitable cell is based on the evaluation standard of the most suitable cell in the GSM system. After that Carry out cell handover between the current resident GSM cell and the target resident GSM cell. The handover process is a standard process defined in 3GPP. After the handover is successful, reside in a new GSM cell and return to step 211, otherwise, directly return to step 211.

Step 213: If the signal quality of all GSM cells that can be monitored is lower than the highest signal quality threshold Up_Sir, then the current dual-mode mobile terminal starts its own WCDMA transceiver, and begins to use the WCDMA transceiver to monitor all the WCDMA signals that can be monitored around. Cell signal quality is measured.

Steps 214-215: Determine whether the cell signal quality of all currently monitored GSM cells is lower than the preset signal quality minimum threshold Low_Sir, where all the monitorable GSM cells include the currently resident GSM cell and the surrounding GSM cells that can be monitored If so, according to the measurement results of the signal quality of all monitored WCDMA cells, determine a WCDMA cell as the target cell to reside in according to the evaluation criteria of the most suitable cell to reside in, and then obtain the target cell to reside in WCDMA The timing information and access resources of the cell are used to prepare for the cell reselection of the current dual-mode mobile terminal from the GSM cell to the WCDMA cell. Here, the evaluation standard is the evaluation standard of the most suitable cell to camp on stipulated in the 3GPP agreement.

Then, the current dual-mode mobile terminal executes a handover from the current resident GSM cell to the selected target resident WCDMA cell, that is, the cell reselection process. The cell reselection process is completely carried out in accordance with the standard process defined in the current 3GPP, and then Return to step 203 and continue to monitor GSM cell signals; otherwise, if the signal quality of one or more GSM cells is higher than the set signal quality minimum threshold Low_Sir, then execute step 212 .

In the process of monitoring GSM cells, for GSM cells whose signal quality exceeds the minimum signal quality threshold Low_Sir, cell reselection between different GSM cells is performed according to the cell reselection standard of the current commercial GSM system, so as to ensure the maximum efficiency of the current commercial system. degree of inheritance.

In addition, when the signals of all GSM cells are lower than the highest signal quality threshold Up_Sir, the dual-mode mobile terminal WCDMA transceiver is started, but before the cell reselection process from the GSM cell to the WCDMA cell is not triggered, some problems may reappear. The signal quality of one or some GSM cells is higher than the situation of the highest signal quality threshold Up_Sir, therefore, a timer can be set, when there is a GSM cell signal quality higher than the signal quality highest threshold Up_Sir under the WCDMA transceiver startup state, Start the set timer, if the signal quality of the GSM cell can still be kept higher than the highest signal quality threshold Up_Sir after the timer expires, then close the WCDMA transceiver of the current dual-mode mobile terminal; otherwise, continue to maintain the WCDMA transceiver The transmitter is activated.

In the above process, the highest signal quality threshold Up_Sir and the lowest signal quality threshold Low_Sir are determined according to the signal quality in the current network, for example, according to the signal-to-noise ratio setting, these two thresholds can directly adopt the settings specified in the 3GPP standard.

Using the above process, the dual-mode mobile terminal can preferentially select the GSM cell as the cell to reside in during the cell selection and reselection process in idle mode; in the area where the GSM network and the WCDMA network overlap Working in the GSM mode, the power consumption of the dual-mode mobile terminal in the idle state can be saved, and the standby time of the dual-mode mobile terminal can be delayed.

For a dual-mode mobile terminal residing in a GSM cell in an idle state, when a voice service is triggered, it directly accesses the voice service from the GSM network where it is located; when the initiated service is a data service, the GSM network cannot meet the requirements. According to the quality of service (QOS) requirements of the data service, the dual-mode mobile terminal in the GSM cell will actively initiate the process of reselecting to the WCDMA cell, and first reside in the WCDMA cell. Complete the access of the data service. If a dual-mode mobile terminal resides in a WCDMA cell and is in an idle state, no matter it is triggered by a voice service or a data service, it can directly initiate service access from the currently camped WCDMA cell. Visible, adopt the present invention and can not influence the use of user's service, simultaneously, because the present invention can guarantee priority to reselect under the idle state and reside in GSM sub-district, so can guarantee that user's voice service preferentially uses GSM network, and data service uses WCDMA network. Since the voice communication power consumption of the dual-mode mobile terminal using GSM is much lower than that of WCDMA voice communication, the invention can greatly improve the talking and standby time of the dual-mode mobile terminal under the same battery capacity.

The above implementation scheme is not only applicable to dual-mode mobile terminals, but also applicable to multi-mode mobile terminals. When a mobile terminal supports multiple mobile communication system modes, priorities can be set for all modes in advance, and the highest priority mode is the preferred mode. , followed by the less preferred mode, and so on. Then, if the multi-mode mobile terminal is currently in the preferred mode, and the signal quality of the cell in the preferred mode meets the camping requirements, then the multi-mode mobile terminal turns off all transceivers of other modes in itself; Mode transceiver, if the signal is still not satisfied, then sequentially turn on the transceiver of the next priority mode, and so on. If the multi-mode mobile terminal is not currently in the preferred mode, the multi-mode mobile terminal will monitor the signals of all the cells that can be monitored in the preferred mode in real time, and reselect to the preferred mode as long as there is one that meets the residency requirement.

For example, there is currently a multi-mode mobile terminal that supports three mobile communication system modes A, B, and C, and the order of priority is A, B, and C from high to low, and A is the preferred mode. Then, if the current After the multi-mode mobile terminal is turned on, it has camped in the cell under A mode and the signal meets the resident standard, then the current multi-mode mobile terminal turns off the transceivers of the B and C modes in itself. Stay in the cell in B or C mode, then the multi-mode mobile terminal monitors the cell in A mode, once it can reselect the cell in A mode, it will immediately complete the selected target from the current resident cell to A mode The process of cell reselection. When the cell in mode A is not reselected, reselection can be performed between the cells in the current camping mode, or the cell with the best signal can be selected between the two modes B and C to complete the reselection. If the current multi-mode mobile terminal is in a cell in mode A, and finds that the signal quality of all the cells that can be monitored cannot meet the resident standard, first turn on the transceiver of mode B in the current multi-mode mobile terminal to determine whether it is in mode B. If the cell meets the criteria for residing, reselection will be performed between cells in mode B, and the cell signal in mode A will be monitored at the same time, and the cell in mode A will be reselected at any time. If the cell in mode B cannot meet the requirements for resident standard, then turn on the C-mode transceiver in the current multi-mode mobile terminal to judge whether the cell in C-mode meets the resident standard, and if so, reselect between cells in C-mode and monitor the Cell signal, ready to reselect the cell in A mode at any time, in this case, you can turn off the transceiver in B mode, or not; if the cell in C mode cannot meet the resident standard, or do not reselect, Or choose a cell with the best signal in A, B, or C modes to reside in.

The control method for cell selection and reselection of multi-mode mobile terminals in the idle state proposed by the present invention is to adopt a control mechanism under the coexistence of 3G network and 2G network coverage areas, without affecting the service usage. Under the premise, the multi-mode mobile terminal can quickly camp in a suitable cell. The present invention mainly utilizes the characteristics of the 2G voice network and the 3G data network, fully considers the difference in power consumption of the multi-mode mobile terminal in different modes, and avoids the frequent cell reselection process between the 2G cell and the 3G cell of the multi-mode mobile terminal. The present invention adopts a simple method to make the multi-mode mobile terminal work preferentially in the 2G cell, and at the same time judge whether the 2G cell satisfies the residency requirements according to a certain threshold criterion, and then reside in the 3G cell if not satisfied; Continue to reside in the 2G cell, and turn off the 3G transceiver on the multi-mode mobile terminal. Since the present invention improves the possibility of multi-mode mobile terminals working in 2G mode, it can greatly reduce the energy consumption of multi-mode mobile terminals, and can make full use of the characteristics of 2G network voice and 3G network data services at the same time, so that the utilization rate of the entire network To achieve the optimum, it also fundamentally avoids the possibility that the multi-mode mobile terminal frequently reselects back and forth between the 2G cell and the 3G cell.

The idea of the present invention can be applied to the coexistence of any two mobile communication systems in the 2G network and the 3G network. In a word, the above description is only a preferred embodiment of the present invention, and is not intended to limit the protection scope of the present invention.

Claims (14)

1. A method for a multi-mode mobile terminal to select a cell, which supports at least two types of mobile communication system modes for a multi-mode mobile terminal. After the power-on registration is successful, it is characterized in that the method for the multi-mode mobile terminal to select a cell to reside in includes: The following steps: a. Judging whether the currently resident cell is a cell in the preferred mode, if yes, proceed to step d, otherwise, proceed to step b; b. The current multi-mode mobile terminal measures the signal quality of all the cells in the preferred mode that can be monitored, and judges whether it can reselect the cell in the preferred mode according to the measurement results. Cell reselection in the cell mode, then enter step c, otherwise, perform reselection between cells in the mobile communication system mode to which the cell currently resides, and then return to step b; c. Judging whether the cell reselection is successful, if successful, the current multimode mobile terminal resides in the cell under the currently selected preferred mode, and enters step d, otherwise, the cell under the mobile communication system mode to which the cell currently resides Perform reselection between cells, and then return to step b; d. The current multi-mode mobile terminal turns off the transceivers of all mobile communication system modes except the preferred mode in itself, and measures the signal quality of all cells in the preferred mode that can be monitored, and then judges whether it is necessary to perform different operations according to the measurement results For cell reselection between cells in different modes, if necessary, turn on the transceiver of another mobile communication system mode in the current multi-mode mobile terminal, and determine the target residence according to the signal quality of the cell in another mobile communication system mode that can be monitored cell, and complete the reselection from the current cell to the target cell; otherwise, return to step d. 2. The method according to claim 1, characterized in that the judging whether the cell in the preferred mode can be reselected in step b is: The current multi-mode mobile terminal evaluates the signal quality of all monitored cells in the preferred mode, and judges whether the signal quality of at least one cell in the preferred mode meets the resident standard, and if so, determines that the current multi-mode mobile terminal can reselect to the cell in the preferred mode; otherwise, it is determined that the current multi-mode mobile terminal cannot reselect to the cell in the preferred mode. 3. The method according to claim 2, wherein when there is more than one cell in the preferred mode that satisfies the camping standard, step b further includes: evaluating the most suitable cell to camp on according to the 3GPP protocol or the 3GPP-2 protocol Standard, to determine the target residential cell in the preferred mode. 4. The method according to claim 1, characterized in that, in step b, performing reselection between cells under the mode to which the cell currently resides further comprises: The current multi-mode mobile terminal measures the signal quality of all the monitored cells in the current resident cell and cell-owned mode, and determines a target resident cell according to the evaluation standard of the most suitable resident cell according to the measurement results, and judges the Whether the determined target cell is the current cell; if yes, the current multi-mode mobile terminal continues to camp in the current cell; otherwise, execute the cell reselection process between the current cell and the target cell . 5. The method according to claim 1, characterized in that before step a, it further comprises: setting the highest threshold value and the lowest threshold value of the cell signal quality in the preferred mode. 6. The method according to claim 5, wherein the judging in step d whether it is necessary to perform cell reselection between cells of different modes is as follows: d1. Judging whether the cell signal quality of all currently monitored cells in the preferred mode is less than the preset maximum signal quality threshold value, if yes, then start the transmission and reception of another mobile communication system mode in the current multi-mode mobile terminal The communication machine monitors the cell signal in another mobile communication system mode, and then executes step d2, otherwise, determines the cell reselection in the preferred mode according to the current signal measurement result, and returns to step d1; d2. Judging whether the cell signal quality of all currently monitored cells in the preferred mode is less than the preset signal quality minimum threshold value, if yes, then determine the target resident cell under another mobile communication system mode, and Execute the reselection from the current cell to the target cell; otherwise, measure all the cell signals that can be monitored in the preferred mode and another mobile communication system mode at the same time, and determine the preferred cell signal according to the measurement results of the cell signal in the preferred mode. cell reselection in mode, return to step d1. 7. The method according to claim 6, characterized in that, after step d1, after turning on the transceiver of another mobile communication system mode in the current multi-mode mobile terminal, further comprising: setting and starting a timer, the timer When the time comes, judge whether there is a cell signal quality in the optimal mode higher than the highest signal quality threshold value, if so, then close the transceiver of another mobile communication system mode in the current multimode mobile terminal; otherwise, continue to maintain the current The transceiver of another mobile communication system mode in the multi-mode mobile terminal is in an on state. 8. The method according to claim 1, wherein when the judgment result in step b is that the cell in the preferred mode cannot be reselected, the method further comprises: the multi-mode mobile terminal judges whether it is outside the preferred mode The cell with the highest priority, if it is, reselects among the cells in the mobile communication system mode to which the cell currently resides; otherwise, monitors the signals of all cells in the highest priority mode other than the preferred mode, and judges whether it can be reselected For the cell with the highest priority mode other than the preferred mode monitored, if it can, complete the reselection from the currently resident cell to the cell with the highest priority mode other than the preferred mode; Reselection is performed between cells in system mode. 9. The method according to claim 1, wherein when the judging result in step c is that cell reselection fails, the method further comprises: the multi-mode mobile terminal judging whether it is in a cell with the highest priority other than the preferred mode , if yes, perform reselection among cells in the mobile communication system mode to which the cell currently resides; otherwise, monitor all cell signals in the mode with the highest priority other than the preferred mode, and judge whether the monitored preferred mode can be reselected If possible, complete the reselection from the currently resident cell to the cell in the highest priority mode other than the preferred mode; to reselect. 10. The method according to claim 1, characterized in that the method further comprises: setting a priority order for all mobile communication system modes supported by the current multi-mode mobile terminal, and then starting another mobile communication system mode in step d The transceiver is: according to the preset priority sequence, the transceiver of the mobile communication system mode with the highest priority other than the preferred mode in the current multi-mode mobile terminal is turned on. 11. The method according to claim 10, characterized in that in step d, the target cell is determined according to the signal quality of the cell in another mobile communication system mode that can be monitored, and the current cell to the target cell is completed. The re-election of the residential area includes: d', judging whether the signal of the cell under the mobile communication system mode of the newly opened transceiver can meet the resident standard, if so, then determine the target according to the signal quality of the cell under the currently selected mobile communication system mode that can be monitored Residential cell, and complete the reselection from the current residential cell to the target residential cell; otherwise, start the next mobile communication system mode according to the order of priority and continue to execute step d'; if there is no next mobile communication system mode then End step d'. 12. The method according to any one of claims 1 to 10, wherein the multi-mode mobile terminal is a dual-mode mobile terminal. 13. The method according to claim 12, wherein the preferred mode is the Global System for Mobile Communications (GSM) mode in the second generation mobile communication network. 14. The method according to claim 13, characterized in that said another mobile communication system mode is a wideband code division multiple access system (WCDMA) mode in the third generation mobile communication network.

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